The big and small end of the rod is measured separately on the fixture. Each side is balanced independently but the overall weight of the rod is kept in mind.
When balancing the rods, we use a balancing fixture to measure both the big and small end. Each side is measured and a base weight is determined much like the pistons; except that both sides have to be balanced. When removing weight from the rod, we cut away at the metal around the big and small ends of the rod. Weight can also be shaved off at the beam itself but be careful not to grind too close to the oil feed holes. Be sure to clean them before every measurement to get an accurate figure.